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Finding the Fourth Proportional to 1,190.84, 1,644.21 and 771.44

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Solution

The fourth proportional to 1,190.84, 1,644.21 and 771.44 is: 1,065.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,190.84 : 1,644.21 = 771.44 : x
  2. Step 2: Convert to fraction form
    1,190.84/1,644.21 = 771.44/x
  3. Step 3: Cross multiply
    1,190.84x = 1,644.21 × 771.44
  4. Step 4: Simplify right side
    1,190.84x = 1,268,401.14
  5. Step 5: Solve for x
    x = 1,268,401.14/1,190.84
  6. Step 6: Final answer
    x = 1,065.14

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.